Names | |
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IUPAC name (2S)-4′,5,7-Trihydroxyflavan-4-one | |
Systematic IUPAC name (2S)-5,7-Dihydroxy-2-(4-hydroxyphenyl)-2,3-dihydro-4H-1-benzopyran-4-one | |
Other names Naringetol; Salipurol; Salipurpol | |
Identifiers | |
3D model (JSmol) | |
ChEBI | |
ChEMBL | |
ChemSpider | |
DrugBank | |
ECHA InfoCard | 100.006.865 |
KEGG | |
PubChem CID | |
UNII | |
CompTox Dashboard (EPA) | |
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Properties | |
C15H12O5 | |
Molar mass | 272.256 g·mol−1 |
Melting point | 251 °C (484 °F; 524 K) [1] |
475 mg/L[ citation needed ] | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Naringenin is a flavanone from the flavonoid group of polyphenols. [2] It is commonly found in citrus fruits, especially as the predominant flavonone in grapefruit. [2]
The fate and biological functions of naringenin in vivo are unknown, remaining under preliminary research, as of 2024. [2] High consumption of dietary naringenin is generally regarded as safe, mainly due to its low bioavailability. [2] Taking dietary supplements or consuming grapefruit excessively may impair the action of anticoagulants and increase the toxicity of various prescription drugs. [2]
Similar to furanocoumarins present in citrus fruits, naringenin may evoke CYP3A4 suppression in the liver and intestines, possibly resulting in adverse interactions with common medications. [2] [3] [4] [5]
Naringenin has the skeleton structure of a flavanone with three hydroxy groups at the 4′, 5, and 7 carbons. [2] It may be found both in the aglycol form, naringenin, or in its glycosidic form, naringin, which has the addition of the disaccharide neohesperidose attached via a glycosidic linkage at carbon 7.
Like the majority of flavanones, naringenin has a single chiral center at carbon 2, although the optical purity is variable. [6] [7] Racemization of (S)-(−)-naringenin has been shown to occur fairly quickly. [8]
Naringenin and its glycoside has been found in a variety of herbs and fruits, including grapefruit, oranges, and lemons, [2] sour orange, [9] sour cherries, [10] tomatoes, [11] cocoa, [12] Greek oregano, [13] water mint, [14] as well as in beans. [15] Ratios of naringenin to naringin vary among sources, [2] as do enantiomeric ratios. [7]
The naringenin-7-glucoside form seems less bioavailable than the aglycol form. [16]
Grapefruit juice can provide much higher plasma concentrations of naringenin than orange juice. [17]
Naringenin can be absorbed from cooked tomato paste. There are 3.8 mg of naringenin in 150 grams of tomato paste. [18]
Naringenin can be produced from naringin by the hydrolytic action of the liver enzyme naringinase. [2] Naringenin is derived from malonyl-CoA and 4-coumaroyl-CoA. [2] The latter is derived from phenylalanine. The resulting tetraketide is acted on by chalcone synthase to give the chalcone that then undergoes ring-closure to naringenin. [19]
The enzyme naringenin 8-dimethylallyltransferase uses dimethylallyl diphosphate and (−)-(2S)-naringenin to produce diphosphate and 8-prenylnaringenin. Cunninghamella elegans , a fungal model organism of the mammalian metabolism, can be used to study the naringenin sulfation. [20]
The fate and biological roles of naringenin are difficult to study because naringenin is rapidly metabolized in the intestine and liver, and its metabolites are destined for excretion. [2] [21] The biological activities of naringenin metabolites are unknown, and likely to be different in structure and function from those of the parent compound. [2] [21]
Flavonoids are a class of polyphenolic secondary metabolites found in plants, and thus commonly consumed in the diets of humans.
Polyphenols are a large family of naturally occurring phenols. They are abundant in plants and structurally diverse. Polyphenols include phenolic acids, flavonoids, tannic acid, and ellagitannin, some of which have been used historically as dyes and for tanning garments.
Cytochrome P450 3A4 is an important enzyme in the body, mainly found in the liver and in the intestine, which in humans is encoded by CYP3A4 gene. It oxidizes small foreign organic molecules (xenobiotics), such as toxins or drugs, so that they can be removed from the body. It is highly homologous to CYP3A5, another important CYP3A enzyme.
Catechin is a flavan-3-ol, a type of secondary metabolite providing antioxidant roles in plants. It belongs to the subgroup of polyphenols called flavonoids.
Quercetin is a plant flavonol from the flavonoid group of polyphenols. It is found in many fruits, vegetables, leaves, seeds, and grains; capers, red onions, and kale are common foods containing appreciable amounts of it. It has a bitter flavor and is used as an ingredient in dietary supplements, beverages, and foods.
Rutin is the glycoside combining the flavonol quercetin and the disaccharide rutinose. It is a flavonoid glycoside found in a wide variety of plants, including citrus.
Naringin is a flavanone-7-O-glycoside between the flavanone naringenin and the disaccharide neohesperidose. The flavonoid naringin occurs naturally in citrus fruits, especially in grapefruit, where naringin is responsible for the fruit's bitter taste. In commercial grapefruit juice production, the enzyme naringinase can be used to remove the bitterness (debittering) created by naringin. In humans naringin is metabolized to the aglycone naringenin by naringinase present in the gut.
Grapefruit seed extract (GSE), also known as citrus seed extract, is a liquid extract derived from the seeds, pulp, and white membranes of grapefruit. GSE is prepared by grinding the grapefruit seed and juiceless pulp, then mixing with glycerin. Commercially available GSEs sold to consumers are made from the seed, pulp, and glycerin blended together. GSE is sold as a dietary supplement and is used in cosmetics.
Hesperidin is a flavanone glycoside found in citrus fruits. Its aglycone is hesperetin. Its name is derived from the word "hesperidium", for fruit produced by citrus trees.
Hesperetin is the 4'-methoxy derivative of eriodictyol, a flavanone. The 7-O-glycoside of hesperetin, hesperidin, is a naturally occurring flavanone-glycoside, the main flavonoid in grapefruits, lemons, and sweet oranges.
Some fruit juices and fruits can interact with numerous drugs, in many cases causing adverse effects. The effect is most studied with grapefruit and grapefruit juice, but similar effects have been observed with certain other citrus fruits.
Flavones are a class of flavonoids based on the backbone of 2-phenylchromen-4-one (2-phenyl-1-benzopyran-4-one).
Naringinase is a debittering enzyme that is used in the commercial production of citrus juices. It breaks down the compound naringin that gives citrus juices its bitter taste. It is a multienzyme complex which possesses alpha-L-rhamnosidase and beta glucosidase active centers. The E.C. No.(EC 3.2.1.40) of the naringinase and rhamnosidase are the same. First rhamnosidase breaks naringin into prunin and rhamnose. Lastly glucosidase breaks prunin into glucose and naringenin, a flavorless flavanone also found in various citrus.
The flavanones, a type of flavonoids, are various aromatic, colorless ketones derived from flavone that often occur in plants as glycosides.
Flavonoids are synthesized by the phenylpropanoid metabolic pathway in which the amino acid phenylalanine is used to produce 4-coumaroyl-CoA. This can be combined with malonyl-CoA to yield the true backbone of flavonoids, a group of compounds called chalcones, which contain two phenyl rings. Conjugate ring-closure of chalcones results in the familiar form of flavonoids, the three-ringed structure of a flavone. The metabolic pathway continues through a series of enzymatic modifications to yield flavanones → dihydroflavonols → anthocyanins. Along this pathway, many products can be formed, including the flavonols, flavan-3-ols, proanthocyanidins (tannins) and a host of other various polyphenolics.
In enzymology, a flavanone 7-O-beta-glucosyltransferase is an enzyme that catalyzes the chemical reaction
Chalconoids, also known as chalcones, are natural phenols derived from chalcone. They form the central core for a variety of important biological compounds.
Narirutin is a flavanone-7-O-glycoside, consisting of the flavanone naringenin bonded with the disaccharide rutinose.
Melitidin is a flavanone glycoside. Melitidin was discovered in bergamot orange juice and exhibits statin-like properties in preclinical research.
Prunin is a flavanone glycoside found in immature citrus fruits and in tomatoes. Its aglycone form is called naringenin.